This seems unlikely, nothing in the DNG code knows about multiple partitions, so there really shouldn't be any difference between CHDK CRW or DNG.

Does shooting with DNG enabled take as long as it would if it was actually saving?

Are the raw/dng related settings the same on both cards? CHDK settings are saved in files on the card, so they could be different on different cards. I would look at "raw in dir with jpeg" and the prefix and extension options.

This seems unlikely, nothing in the DNG code knows about multiple partitions, so there really shouldn't be any difference between CHDK CRW or DNG.

Does shooting with DNG enabled take as long as it would if it was actually saving?

Yes, it takes nearly the same time that shooting in .CRW. But every photo I take checking "DNG format" is saved in .JPG but not in .DNG...

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Are the raw/dng related settings the same on both cards? CHDK settings are saved in files on the card, so they could be different on different cards. I would look at "raw in dir with jpeg" and the prefix and extension options.

Will look at it and tell you, I have not the camera with me right now.